When looking for commercial HVAC companies check their experience and talk to their previous clients about the service they have provided.
Beware of HVAC contractors who give you an estimate by telephone. Just as two cars cannot be the same, two air conditioning units are not the same. There are various factors that technicians cannot solve by telephone.
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This includes ducting conditions, the exact number of registers in each room, type of insulation, type of window and many other factors. After recording all these things, a trained HVAC contractor will calculate the J-Manual for your AC.
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All this cannot be done by telephone because the contractor is doing either inexperienced or trying to get your business without using gasoline and the time needed to visit. Experienced people will crawl in your attic, crawl the space and walk around the entire house.
Make sure the Contractor does not replace your old system with the same type of unit as before. A trained contractor will recommend various options to renew your home and increase the efficiency of your home.
If a commercial HVAC company tries to sell an older model to you, keep in mind that they unpack a portion of their own inventory. Choose an authentic company that stores minimum inventory and adjusts the ac unit for your home and uses the most energy efficient unit.
When you don't have an authorized dealer near your area, ask your contractor to buy a new system instead of using their old inventory. Very rarely have the same system that you need to be put in a warehouse and all AC units are not the same.